Electric switch



F. SCHWEEN June 7, 1932.

ELECTRIC SWITCH Filed Aug. 27, 1929 JIM/@2260)":

,, ed or inserted and fixed b 10. 11 is the foot on the Patented June 7, 1932 PATENT OFFICE rar'rz scnwmn, or BERLIN, 6mm

ELECTRIC SWITCH Application filed August 27, 1929, Serial No. 388,885, and in Germany June 87, 1929.

This invention relates to certain new and useful improvements in tire deflation indicators and has for its primary object to provide a device to give an audible or visual signal to indicate deflation of a tire.

It is a further object of the invention to provide a flexible member housing spaced contacts therein with the flexible member closed at each end to exclude dirt and other foreign matter with one of the contacts carried by an adjustable support within the tubular member.

The gap betweenthe base body and the foot forms an air bufier.

An embodiment oft'he invention is illustrated by way of example in the accompanying drawing in which:

Fig. 1 is a cross section on line a-a of Fig. 2,

. Fig. 2 is a side elevation,

- Fig. 3 shows how the tire deflation indica- {pi is arranged on the chassis of the automo- 1 designates the upper part of the indicator, fixed by means of screws at a suitable point of the chassis or of the car spring. 2 designates the insulating bush. 3 and 4 designate the contact screw and the contact body respectively. The tubular rubber sheath 5 has its upper end received on the lower end of the upper part 1 of the indicator and a metal ring 6 enclosing the upper end of the sheath 5 holds the latter in binding engagement with the upper part 1. The numeral 7 designates a contact rod consisting of a tightly wound spiral spring. 8 is a collar-like contact crown in the spiral spring. 9 is the base body in which the spiral spring contact rod is threadmeans of a rivet ase bod 12 is a metal ring surrounding the tubu ar sheath and by which the base body and the contact rod are held in the rubber sheath spaced the one from the other. 13 is the insert piece and o 14 the hardened sliding foot formed like a 0 moves the adjacent portion of thesheath into binding engagement with the base body 9,

and to adjust the contact 8 relative to the contact 4, the insert 13 is removed, the ring 12 moved toward the lower end of the sheath, whereupon the base body may be shifted in the desired direction in the sheath. .The 5. ring 12 is then moved to a position surrounding thebase body to clamp the latter in position.

With the foregoing construction, dust, air and water is prevented from entering the o0 tubular sleeve by the upper ring'fi having binding engagement with the upper end of the sheath while the lower ring 15 has bindin engagement with the lower end of the sheat 1 and the insert 13. It will also be observed that the insert 13 is spaced from the base body 9 to provide an intervening air space or pocket forming a cushioning element for the absorption of excessive shock when the insert 13 is moved into contact with the ground.

I claim In an electric indicator for tire deflation comprising in combination, a tubular rubber sheath closed at both ends to form a dust, air and water-tight closure, a base body in said sheath, a contact rod of spiral s ring formation screwed into said base b y, and a metal ring on the outer side of said sheath in surrounding relation to the base member so adapted to hold the adjacent portion of the sheath in. binding engagement with the base member, said ring being shiftable out of surrounding relation to the base member to permit adjustment of the latter and the spiral spring contact carried thereby.

In testimony whereof I afiix my signature.

FRITZ SCHWVIEN. 

